That ship likely left China before the war even started assuming a 45-60 day transit.
Precursor fuels for liquid fuel missiles still requires the infrastructure to process the fuels and the ability to produce the rocket motor engines and gyroscopes and other component assembly. It’s possible Iran has some underground workshops, but large scale missile production is likely severely hampered. Unless this fuel is merely to be used on existing liquid fuel missiles hulls that have been produced pre-war.
Then there is the solid fuel side of things. Without the solid fuel mixers and casting pits, it seems unlikely iran will be able to build solid fuel or quasi solid fuel missiles in the short term, solid fuel which makes up its entire SRBM arsenal and a few of their MRBM arsenal (Haj Qassem missile, Sejil 2, and Keyibar Shekan, Fattah 1).
In short, iran will not be able replenish any significant missiles in next 2-4 weeks or even 2 months. It will likely take months for Iran to rebuild the infrastructure and important the industrial equipment (from China) to restart large scale missile production. In the meantime, some small quantities could be produced by workshops located in underground missiles bases using equipment and fuel reserves specially prepared for war time.